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Optical Engineering • Open Access

Evaluation of the surface strength of glass plates shaped by hot slumping process
Author(s): Laura Proserpio; Stefano Basso; Francesco Borsa; Oberto Citterio; Marta Civitani; Mauro Ghigo; Giovanni Pareschi; Bianca Salmaso; Giorgia Sironi; Daniele Spiga; Gianpiero Tagliaferri; Alberto D’Este; Roberto Dall’Igna; Mirko Silvestri; Giancarlo Parodi; Francesco Martelli; Marcos Bavdaz; Eric Wille

Paper Abstract

Hot slumping technology is under development by several research groups in the world for the realization of grazing-incidence segmented mirrors for x-ray astronomy, based on thin glass plates shaped over a mold at temperatures above the transformation point. The performed thermal cycle and related operations might have effects on the strength of the glass, with consequences for the structural design of the elemental optical modules and, consequently, on the entire x-ray optic for large astronomical missions such as IXO and ATHENA. The mechanical strength of glass plates after they underwent the slumping process was tested through destructive double-ring tests in the context of a study performed by the Astronomical Observatory of Brera with the collaboration of Stazione Sperimentale del Vetro and BCV Progetti. The entire study was done on more than 200 D263 Schott borosilicate glass specimens of dimensions 100  mm×100  mm and a thickness 0.4 mm, either flat or bent at a radius of curvature of 1000 mm through the pressure-assisted hot slumping process developed by INAF-OAB. The collected experimental data have been compared with nonlinear finite element model analyses and treated with the Weibull statistic to assess the current IXO glass x-ray telescope design, in terms of survival probability, when subjected to static and acoustic loads characteristic of the launch phase. The paper describes the activities performed and presents the obtained results.

Paper Details

Date Published: 4 August 2014
PDF: 13 pages
Opt. Eng. 53(8) 085101 doi: 10.1117/1.OE.53.8.085101
Published in: Optical Engineering Volume 53, Issue 8
Show Author Affiliations
Laura Proserpio, INAF - Osservatorio Astronomico di Brera (Italy)
Max-Planck-Institut für extraterrestrische Physik (Germany)
Stefano Basso, INAF - Osservatorio Astronomico di Brera (Italy)
Francesco Borsa, INAF - Osservatorio Astronomico di Brera (Italy)
Oberto Citterio, INAF - Osservatorio Astronomico di Brera (Italy)
Marta Civitani, INAF - Osservatorio Astronomico di Brera (Italy)
Mauro Ghigo, INAF - Osservatorio Astronomico di Brera (Italy)
Giovanni Pareschi, INAF - Osservatorio Astronomico di Brera (Italy)
Bianca Salmaso, INAF - Osservatorio Astronomico di Brera (Italy)
Univ. degli Studi dell’Insubria (Italy)
Giorgia Sironi, INAF - Osservatorio Astronomico di Brera (Italy)
Daniele Spiga, INAF - Osservatorio Astronomico di Brera (Italy)
Gianpiero Tagliaferri, INAF - Osservatorio Astronomico di Brera (Italy)
Alberto D’Este, Stazione Sperimentale del Vetro (Italy)
Roberto Dall’Igna, Stazione Sperimentale del Vetro (Italy)
Mirko Silvestri, Stazione Sperimentale del Vetro (Italy)
Giancarlo Parodi, BCV Progetti S.r.l. (Italy)
Francesco Martelli, BCV Progetti S.r.l. (Italy)
Marcos Bavdaz, European Space Research and Technology Ctr. (Netherlands)
Eric Wille, European Space Research and Technology Ctr. (Netherlands)


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